Some improv games, known by a particular name, are actually minor variations on a broader improv game. For those, the link will refer to the broader game handle, and you'll find the particular sub-format indexed here indicated in bold in the text. For an example, take a look at Scene Replay.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something --- Franklin D. Roosevelt